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Empty Class Size
What is the size of an empty class?
deep
- Oct 13th, 2011
What is the output for the below example?
Code- #include iostream
cpfeed
- Oct 29th, 2009
Class A{}most of time sizeof(A) = 1, however, it is a small integer regarding to the complier.
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Matrix Operation using Operator Overloading
Write a program for four atrithmetic operations in matrix using operator overloading.
Nested Classes
Do Nested Clases exists? If so, where are they used?
coolba
- Mar 8th, 2010
Many of us had heard about inner class. That means class inside a class which is nothing but nesting of classes. Where You can use the members, functions of outer class but the vice versa is not true.
pavan khubani
- Feb 13th, 2010
Yes,For e.g., in class Employee, we can have class Name as member class.
Virtual Constructor
Why constructor cannot be virtual in C++?
C++ Type Conversion
Why does 'float' accept 'int' but not 'char'?
Classes
The copy constructor of class Money is called in which of the following cases?Choose one answer. a. Money amount1;Money amount2(amount 1); b. void func(Money amount);[...]Money amount1;[...]func(amount1); c. Money func();[...]Money amount1 = func(); d. all of the above
jaroo
- Oct 2nd, 2011
The correct answwer is:
"D. all of the above"
Memory Allocation
When is memory allocated for a function of a class? Is it when the program is complied, or only when the function is called?
wlochaty
- Jan 19th, 2011
Memory will be alocated during compilation but when there is no objects of the class than no memory may be allocated. Compiler may (not must) do some optimalizations when there is no instances of the class (no funcion call).
What is the Size of an Empty Class
What is the logic behind size of an empty class = 1? (As per C++)Ex:class base {};main(){printf("Size of the Empty Class is: %dn", sizeof(base));}It gives output: Size of the Empty Class is: 1I have not got the reason / logic behind this.Can anyone help me?
nilesh2080
- Mar 11th, 2011
The size of the empty class is i byte because empty class will provide the default constructor, default destructor, default copy constructor and default assigment operator. These function are called by the address of the pointer to functions, so the size of these address is 1 byte.
amitmanish
- Mar 4th, 2011
The size of an empty class's object is 1. The reason for this is that suppose if we have the size as 0, then two objects created one after the other would point to the same address. Having the siz...
Constructor initialization lists
What is advantage of using Constructor initialization lists?
Paul_Singh
- Feb 7th, 2012
For some object the initialized list is necessary because they are const or do not have default constructors. However, the main advantage is that if you construct the object in the constructor body th...
abc
- Feb 5th, 2012
--> initializer list is used with constructor when any const datas are used in a class. --> bcoz, as we known const var should be initialized while declaring. --> the class gets memory allocatio...
Solve this using C++ code
Write a solution in any language to the following: Given a large list of integers (more than 1 000 000 values) find how many ways there are of selecting two of them that add up to 0
What are virtual functions?
A virtual function allows derived classes to replace the implementation provided by the base class. The compiler makes sure the replacement is always called whenever the object in question is actually of the derived class, even if the object is accessed by a base pointer rather than a derived pointer. This allows algorithms in the base class to be replaced in the derived class, even if users don't...
MCBod
- Mar 31st, 2010
A virtual function is a member function of a class fro which it expects child functions to provide their own implementations. My specifiying the function as virtual we allow polymorphism to take place...
gunjan.chandra
- Jun 12th, 2009
It is a functions whose behaviour can be?overriden with an inherited class by a function of same signature. It is an important part of OOPS and Polymorphism.
What are the types of STL containers?
srinu5019
- Mar 21st, 2011
Sequential containers-> vectors,Deque,listAssosiative containers->set,multiset,map,multimapDerived containers->stack,queue,priority queue
What is the difference between Function and Member function?
KAIRAV
- Feb 27th, 2018
NO BRO!! A member function can be defined outside the class
SomGollakota
- Jun 13th, 2007
Assuming function is not a part of any class, and member function (obviously) is a part of a class, the difference is their scope.1. Function - is normally refered to a C-style function which has a gl...
While copying the objects if we say X a=b, X a(b) What will it call, assignment operator or copy constructor? Justify
lddung19720603
- Jul 28th, 2009
In both cases the copy constructor will be called. If we have a=b alone, then the assignment operator will be called.
How can you force instantiation of a template?
A
moonlight100783
- Jan 20th, 2008
To add...When a template is specialized as above, it is mandatory to define the same. The C++ compiler will not generate a class for the specialization.
michaelpyles
- Dec 29th, 2007
You can force the instantiation of a specialization of the template by specifying a prototype somewhere in your code. For example:template <class T> class A { T x; ...
What is an iterator?
vidhudatta
- Sep 23rd, 2009
Iterator is an object that allows the programmer to traverse through the entire collection.
shwetashreemal
- Jul 25th, 2009
Iterator is a class that is used to traverse through the objects maintained by a container class.these are five types are:-1.Input iterator2.output iterator3.forward iterator4.bidirectional iterator5....
What is the difference betwen wait() and delay()?
yzesong
- Aug 1st, 2009
In a proces which issues wait( ) will suspend itself until either a certain process terminated(wait(n), n is PID) or all process terminated (wait()). Delay is like pausing for a certain period of time, same as sleep( ).
3bu1
- Aug 21st, 2007
Wait()....event triggereddelay()....time trigerred
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